Carroting solution



Patented Nov. 3, 1942" canaormo SOLUTION Constantine r. Fabian,Brookfleld, Conn.

N Drawing.

Original application December 10,

1940, Serial No. 369,433. Divided and this application August 15, 1942,Serial No. 454,920

7 Claims. (Cl. 8-112) same substances are added to the older metallicThis invention relates to the art of carroting f animal fiber and to acarroting solution used in the carroting process. The invention aims topreserve the strength, weight, and natural color of the fur, and is adivision of my co-pending application Serial No. 369,433, filed December10,

1940, for an invention in the Art of carroting animal fibers andcarroting solutions for same.

In my study of physical and chemical manifestations in animal fiberprior to and after carroting processes, I have observed and establishedthe fact that great changes have occurred in the fiber in two respectscapable of measurement,

namely, decrease of tensile strength of the fiber,

and loss of weight in the manufacture of felt hats. I have furtherestablished the fact that these two factors accompany each other, thatis o say, the greater the decrease of tensile strength, the greater theloss of weight.

The reason for this decrease in tensile strength and loss of weight isthat during the carroting a strong hydrolytic action takes place and thefiber substance is degraded into soluble peptones and amino-acids, andthe greater the formation of soluble peptones and amino-acids thegreater will be the decrease in tensile strength and loss of weight.

The effects above described are observed whether the carroting solutionbe of the older mercury nitrate type or of the now commonly usednon-mercuric type, and specifically that disclosed in Fabian Patent No.2,169,997. The patent just mentioned discloses a carroting solutionhaving a high concentration of nitric acid in combination with hydrogenperoxid and without any metal or mineral salt present therein. In thefollowing description carroting solutions of the type disclosed in theabove mentioned patent will be denominated as solutions containing highconcentration of ntiric acid. Carroting solutions containing highconcentration of nitric acid, which do not contain any heavy metalsalts, will apply whether these solutions contain the inhibitorsdisclosed in Fabian Patents Nos. 2,087,857, 2,087,856, 2,087,855,2,087,854 and 2,048,645 or not and likewise apply whether or not thesolutions contain the neutral salts of Patent No. 2,144,487.

I have discovered that the addition of products of protein degradation,as for example gelatin, gelatin peptones, cystine. glycccols and 'leucinto carroting solutions of the hi h concentration nitric acid typepreserve the tensile strength and weight of the fur during the feltingprocess, thereby yielding superior felt. I have alsodistypes ofcarroting solutions.

The probable explanation of the inhibiting action of products of proteindegradation in these carroting processes utilizing carroting solutionsof the high nitric acid concentration type can be found in thepossibilities of increasing the viscosity of the film formed on thefiber during the first stage of hydrolytic action by strong acids. Sucha product as gelatin peptone in the carroting solution coagulates thecomponents of the film on the surface of the fiber and prevents ex-,

cessively deep penetration of the strong hydrolytic acid into thesubstance of the animal fiber. The effect of the addition of peptonesand aminoacids is to provide a butler which controls the depth and theintensity of the hydrolytic action of the hereinbefore mentioned strongacids on the fibers.

In addition to the Preservation of the tensile strength and weight ofthe fur during the carroting process, I have observed and established asa fact that the presence of products of protein degradation in carrotingsolutions of the high nitric acid concentration type greatly preventsdiscoloration of the fiber, and furthermore that the preservation of thenatural color of the fur is even more effective when the products ofprotein degradation are coordinated in the carroting solution withso-called anti-oxidants such as those mentioned in U. S. Patent No.2,144,487.

The probable explanation is that such a product as gelatin inhibitsexcessive dispersion of the aniline dyes used in a carroting solution,and acts on them as a lake, converting anti-oxidants on the fiber intoinsoluble compounds.

The amounts of the products of protein degradation employed in thecarroting solutions can be varied in wide range, depending upon theconcentration of hydrolytic agents used in the carroting composition.The higher the concentration of the hydrolytic agents, the greater theamount of gelatin peptone, for example, is required. However, I preferto use not more than 3% of gelatin or gelatin peptone, and not more than2% of cystine. rectly by being dissolved in hot water, or converted intogelatin peptone by prolonged boilingin water.

The invention will be best understood by reference to the followingexamples of carroting solution which can be prepared according to thegeneral principles of my invention, and intended for application to theanimal fibers. It will be covered that this result does not occur whenthe 5s. understood that in these examples the carroting Gelatin can beused di- 7 composition comprises an aqueous solution of the chemicalsubstances named, the weights of which are given in percentages of thetotal weight or the solution.

Example I v Per cent Nitric acid (tech. 40 B.) Hydrogen peroxide (100V.) Gelatin 3 Water 62 Example I! Per cent Nitric acid (tech. 40 B.) 14Hydrogen peroxide (100 V.) 15

Sodium bisulphite oi 1:2-dihydroxy-anthraquinone p quinoline (CuHaNOH-containing a high concentration of nitric acid in the magnitude of 12%or more, hydrogen peroxide and cystine, said cystine being present in anamount not exceeding 2% by weight or the total weight of the solution.

3. A composition for use in the carroting 01 animal fiber consisting ofan aqueous solution containing a high concentration of nitric acid inthe magnitude of 12% or more, hydrogen peroxide and cystine, saidcystine being present in an amount not exceeding 1.5% by weight of theWhat is claimed is 1. A composition for use in the carroting oi animalfiber consistingof an aqueous solution containing a high concentrationof nitric acid in the magnitude of 12% or more, hydrogen peroxide and anamino-acid from the roup originating in protein degradation, saidamino-acid being present in an amount not exceeding 3% by weight of thetotal weight of the solution.

2. A composition for use in the carroting of animal fiber consisting ofan aqueous solution total weight of the solution.

4. A composition for use in the carroting oi animal-fiber consisting ofan aqueous solution containing a high concentration of nitric acid inthe magnitude of 12% or more, hydrogen peroxide and gelatin peptone,said gelatin peptone being present in an amount not exceeding 2% byweight of the total weight of thesolution.

5.'A composition for use 'in the carroting of animal fiber consisting ofan aqueous solution containing nitric acid in high concentration,hydrogen peroxide, anti-oxidants and gelatin peptones in an amount notexceeding 2% by weight of the total weight of the solution.

6. A c'ompositionior use in the carroting of animal fiber consisting ofan aqueous solution containing 14% by weight of nitric acid (tech. 1

40 B.),- 15% by weight. hydrogen. peroxide V.) 0.3% by weight of sodiumbisulphite oi 1:2-dihydroxyanthraquinone-p-quinoline, 1.5% by weight ofcystine, and 69.2% by weight of water.

7. A composition for use in the carroting of animal fiber consisting ofan aqueous solution containing 12% byweight of nitric acid (tech. 40Be"), 14% by weight of hydrogen peroxide (100 V.) 3% by weight ofanhydrous sodium sulphate, 1% by weight ethyl alcohol, 0.01% by weightsodium salicylate, 0.05% by weight of metaphosphoric acid, 0.1% byweight of the sodium salt of1-amino-2-methyl-4-o-sulplro-ptoiylamino-anthraquinone, 2% by weight ofgelatin peptone, and 67.84% of water.

CONSTANTINE F. FABIAN.

